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When people think about the sources of greenhouse gas emissions, they think of oil refineries, smokestacks, and trucks spewing out thick black smoke. They don't usually think of cows.

But recently, the idea that cattle could be a source of greenhouse gas has been attracting attention. It turns out that the belches of cows, sheep, and other livestock animals contain substantial amounts of methane, a particularly potent greenhouse gas that has about 25 times the global warming potential of carbon dioxide.